Composite is usually adopted in civil aircraft main landing gear (MLG) structure. In this paper, the structural design requirements and methods for civil aircraft MLG fairing are proposed. The paper introduces the normal technical schemes, including structure form, composition, connection mode, etc. To ensure advancements of the design methods, maturity and feasibility of the technical scheme, we have to consider structure design requirements such as function, bearing capacity, durability and so on. Since the internal structures often meet with severe environment, meanwhile, structure protection and maintainability should also be taken into consideration, which has a nice impact resistance and moisture resistance.